java.lang.String android.os.Bundle.getString（java.lang.String）和#x27；关于空对象引用

我试图将数据从PageAdapter发送到一个片段两天，但没有成功。 我正在使用Bundle，并按如下方式发送：

     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ficha__completa);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        nome="Chimpanze";

        try {
            Bundle bundle = new Bundle();
            bundle.putString("Nome_animal",nome);
            Imagem_Animal imagem = new Imagem_Animal();
            imagem.setArguments(bundle);
        } catch (Exception e) {
            Log.d(TAG_LOG,"Erro de bundle: "+e.getLocalizedMessage());
        }
    }

public class Imagem_Animal extends Fragment {
    ImageView imagem_p;
    static final String TAG ="Fragmento";
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View Layout_imagem = inflater.inflate(R.layout.fragment_imagem__animal, container, false);
        imagem_p = (ImageView) Layout_imagem.findViewById(R.id.imagem);
        try {
            String nomeAnimal = getArguments().getString("Nome_animal");
        } catch (Exception e){
            Log.d(TAG, "getStirng :"+e.getMessage());
        }
        return Layout_imagem;
    }
}

我的片段是这样的：

     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ficha__completa);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        nome="Chimpanze";

        try {
            Bundle bundle = new Bundle();
            bundle.putString("Nome_animal",nome);
            Imagem_Animal imagem = new Imagem_Animal();
            imagem.setArguments(bundle);
        } catch (Exception e) {
            Log.d(TAG_LOG,"Erro de bundle: "+e.getLocalizedMessage());
        }
    }

public class Imagem_Animal extends Fragment {
    ImageView imagem_p;
    static final String TAG ="Fragmento";
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View Layout_imagem = inflater.inflate(R.layout.fragment_imagem__animal, container, false);
        imagem_p = (ImageView) Layout_imagem.findViewById(R.id.imagem);
        try {
            String nomeAnimal = getArguments().getString("Nome_animal");
        } catch (Exception e){
            Log.d(TAG, "getStirng :"+e.getMessage());
        }
        return Layout_imagem;
    }
}

Log:getString:尝试在空对象引用上调用虚拟方法“java.lang.String android.os.BaseBundle.getString（java.lang.String）”

有人能帮我吗

---

非常感谢您

在您的片段中创建函数，如下所示

 public void someFunctionName(String data){

 }

@Override
public Fragment getItem(int position) {
    Imagem_Animal ani= new Imagem_Animal();
    ani.someFunctionName("yourdata");
    return ani;
}

在寻呼机适配器中，执行如下操作

 public void someFunctionName(String data){

 }

@Override
public Fragment getItem(int position) {
    Imagem_Animal ani= new Imagem_Animal();
    ani.someFunctionName("yourdata");
    return ani;
}

---

如果片段在您的

维护

中

就这些了，实际上

页面编辑器

在。然后您可以访问

Imagem_Animal

Fragment

中的字段，如

((MainActivity) getActivity()).nome

---

而不是以捆绑方式传递。

我试图将数据从PageAdapter发送到片段？为什么不使用MainActivity的上下文访问数据呢？发布并接受您的答案。这将对未来的开发人员更有帮助。非常感谢，但我使用了另一种解决方案：）我尝试了这种方法，并不断返回相同的错误：/n然后检查为什么

nome

字段是空的，如果您像上面那样访问它。可能是在初始化变量之前加载的

片段

。在初始化变量后设置您的

PagerAdapter

。错误是关于上下文不正确的Toast，而不是关于获取数据！非常感谢。